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Mok CW, Zheng Q, Shi L, Tan SM. Abstract P3-03-26: Challenging dual modality as the gold standard for sentinel lymph node biopsy in breast cancer: A systematic review and network meta-analysis of novel and conventional techniques. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p3-03-26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The current gold standard for sentinel lymph node biopsy in breast cancer patients is the dual modality technique (radioisotope and blue dye). Owing to the limitations inherent to the use of radioisotopes, the uptake of this method is limited to approximately 50-60% of breast cancer patients in developed countries. In most centers worldwide with no access to radioisotopes, blue dye is the most commonly employed technique as it is relatively cheap, easy to administer with no radiation exposure risk. However, the use of blue dye is associated with a high false negative rate. We performed a systematic review and network meta-analysis to compare the performance of blue dye and radioisotope against three novel techniques, namely indocyanine green fluorescence (ICG), superparamagnetic iron oxide (SPIO) nanoparticles and contrast enhanced ultrasound (CEUS) using microbubbles. This is the first network meta-analysis synthesizing direct as well as indirect comparisons of performance among different techniques in terms of sentinel lymph node detection and false negative rate, thereby allowing a more robust quantitative analysis. In comparison to a published systematic review on this topic in 2014, the current review had almost double the number of patients and trials included with a total of 35 cohort studies and 4,244 patients. Our systematic review suggested that two of the techniques, indocyanine green fluorescence (ICG) and superparamagnetic iron oxide (SPIO) nanoparticles have consistently performed better than the blue dye technique and similar to gold standard dual modality. Hence, in centres where blue dye was used as a single modality, perhaps ICG and SPIO can offer a viable alternative with improved performance. Future research should focus on the economic evaluations of various techniques as well as to explore the cost-effectiveness and cost-utility of adopting new techniques in the clinical setting.
Table 2Pooled estimates of RR and averages on detection rate and false negative rate from network meta-analysis (RR)ICG1.03 (0.96, 1.11)1.08 (1.00, 1.15)1.03 (0.99, 1.06)1.05 (0.96, 1.14)1.12 (1.07, 1.16)*0.67 (0.21, 2.08)SPIO1.03 (0.95, 1.12)0.99 (0.93, 1.06)1.01 (0.95, 1.07)1.09 (1.01, 1.18)*0.16 (0.52, 0.05)0.24 (0.05, 1.08)CEUS0.96 (0.89, 1.02)0.98 (0.90, 1.06)1.03 (0.98, 1.11)0.64 (0.36, 1.13)0.96 (0.34, 2.75)4.00 (1.17, 13.7)*Tc1.00 (0.91, 1.10)1.09 (1.04, 1.15)*0.56 (0.14, 2.23)0.84 (0.36, 1.93)3.49 (0.67, 18.2)0.87 (0.24, 3.23)Tc/BD1.09 (0.98, 1.16)0.29 (0.16, 0.54)*0.45 (0.14, 1.45)1.85 (0.68, 6.06)0.44 (0.20, 0.96)*0.57 (0.13, 2.51)BDBD: Blue dye; CEUS: Contrast-enhanced ultrasound; ICG: Indocyanine green; SPIO: Superparamagnetic iron oxide; Tc: Technetium-99; Tc/BD: Combined used of Technetium-99 and blue dye Top right panel reported the pooled RRs of detection rate from network meta-analysis, and the technique name below each RR was the reference group; Bottom left panel reported the pooled RRs of false negative rate from network meta-analysis, and the technique name to the right of each RR was the reference group; *: Statistical significant with P value < 0.05
Citation Format: Mok CW, Zheng Q, Shi L, Tan S-M. Challenging dual modality as the gold standard for sentinel lymph node biopsy in breast cancer: A systematic review and network meta-analysis of novel and conventional techniques [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P3-03-26.
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Cao HT, Yang YJ, Zheng Q, Shi B, Li CH. [New insight of craniofacial and oral findings of the RASopathies]. ZHONGHUA KOU QIANG YI XUE ZA ZHI = ZHONGHUA KOUQIANG YIXUE ZAZHI = CHINESE JOURNAL OF STOMATOLOGY 2019; 53:858-861. [PMID: 30522213 DOI: 10.3760/cma.j.issn.1002-0098.2018.12.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The RASopathies are a group of syndromes that have in common germline mutations in genes that encode components of the RAS/mitogen-activated protein kinase (MAPK) pathway and have been a focus of study to understand the role of this pathway in development and disease. These syndromes include Noonan syndrome (NS), NS with multiple lentigines (NSML), neu-rofibromatosis type 1 (NF1), Costello syndrome (CS), cardio-facio-cutaneous (CFC) syndrome, neurofibromatosis type 1-like syndrome (NFLS) and capillary malformation-arteriovenous malformation syndrome (CM-AVM). These disorders affect multiple systems, including the craniofacial complex. Although the crani-ofacial features have been well described and can aid in clinical diagnosis, the dental phenotypes have not been analysed in detail for each of the RASopathies. In this review, we summarize the clinical features of the RASopathies, highlighting the reported craniofacial and dental findings.
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Zheng Q, Furth SL, Tasian GE, Fan Y. Computer-aided diagnosis of congenital abnormalities of the kidney and urinary tract in children based on ultrasound imaging data by integrating texture image features and deep transfer learning image features. J Pediatr Urol 2019; 15:75.e1-75.e7. [PMID: 30473474 PMCID: PMC6410741 DOI: 10.1016/j.jpurol.2018.10.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 10/20/2018] [Accepted: 10/25/2018] [Indexed: 12/29/2022]
Abstract
INTRODUCTION Anatomic characteristics of kidneys derived from ultrasound images are potential biomarkers of children with congenital abnormalities of the kidney and urinary tract (CAKUT), but current methods are limited by the lack of automated processes that accurately classify diseased and normal kidneys. OBJECTIVE The objective of the study was to evaluate the diagnostic performance of deep transfer learning techniques to classify kidneys of normal children and those with CAKUT. STUDY DESIGN A transfer learning method was developed to extract features of kidneys from ultrasound images obtained during routine clinical care of 50 children with CAKUT and 50 controls. To classify diseased and normal kidneys, support vector machine classifiers were built on the extracted features using (1) transfer learning imaging features from a pretrained deep learning model, (2) conventional imaging features, and (3) their combination. These classifiers were compared, and their diagnosis performance was measured using area under the receiver operating characteristic curve (AUC), accuracy, specificity, and sensitivity. RESULTS The AUC for classifiers built on the combination features were 0.92, 0.88, and 0.92 for discriminating the left, right, and bilateral abnormal kidney scans from controls with classification rates of 84%, 81%, and 87%; specificity of 84%, 74%, and 88%; and sensitivity of 85%, 88%, and 86%, respectively. These classifiers performed better than classifiers built on either the transfer learning features or the conventional features alone (p < 0.001). DISCUSSION The present study validated transfer learning techniques for imaging feature extraction of ultrasound images to build classifiers for distinguishing children with CAKUT from controls. The experiments have demonstrated that the classifiers built on the transfer learning features and conventional image features could distinguish abnormal kidney images from controls with AUCs greater than 0.88, indicating that classification of ultrasound kidney scans has a great potential to aid kidney disease diagnosis. A limitation of the present study is the moderate number of patients that contributed data to the transfer learning approach. CONCLUSIONS The combination of transfer learning and conventional imaging features yielded the best classification performance for distinguishing children with CAKUT from controls based on ultrasound images of kidneys.
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Barrow AS, Smedley CJ, Zheng Q, Li S, Dong J, Moses JE. The growing applications of SuFEx click chemistry. Chem Soc Rev 2019; 48:4731-4758. [DOI: 10.1039/c8cs00960k] [Citation(s) in RCA: 181] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
SuFEx (Sulfur Fluoride Exchange) is a modular, next generation family of click reactions, geared towards the rapid and reliable assembly of functional molecules.
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Liang J, Kim B, Xu X, Raymo J, Ofstedal M, Zheng Q, Kim B. HEALTH AND TRAJECTORIES OF LIVING ARRANGEMENTS AMONG YOUNG-OLD AND OLD-OLD AMERICANS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Yao Q, Diao Y, Zheng Q, Lv T, Song K, Liu S, Dai S, Cui Z. Laparoscopic Bilateral Gonadectomy for a Patient with Turner's Syndrome and Hyperandrogenism. J Minim Invasive Gynecol 2018. [DOI: 10.1016/j.jmig.2018.09.741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ofstedal M, Kim B, Liang J, Zheng Q, Xu X, Raymo J. FACTORS ASSOCIATED WITH CORESIDENCE AND PROXIMATE RESIDENCE BETWEEN ADULT CHILDREN AND OLDER PARENTS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Xu X, Liang J, Kim B, Ofstedal M, Raymo J, Zheng Q. TRAJECTORIES OF LIVING ARRANGEMENTS AMONG CHILDLESS OLDER AMERICANS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.587] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Chen S, Meng Y, Shen Y, Ning X, Xiong C, Lin Z, Zheng Q, Zheng Z, Yin P, Huang H, Yao M. Chemotherapy May Not be Necessary in Stage II Nasopharyngeal Carcinoma Treated with Intensity-Modulated Radiation Therapy. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.06.313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Zhai X, Wang Z, Zheng Q. P1.16-62 A Nomogram to Predict Disease-Free Survival After Curative Resection of Non-Small Cell Lung Cancer. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wang Y, Wang Z, Zheng Q. Nomogram for predicting the benefit of surgery for stage IA-IIB small cell lung cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy298.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Xu W, Liu X, Yu Z, Zhang W, Zheng Q, Liu Z. MRI features of pancreatic intraductal papillary mucinous neoplasms associated with invasive carcinoma. Clin Radiol 2018. [DOI: 10.1016/j.crad.2018.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Mo MZ, Chen Z, Li RK, Dunning M, Witte BBL, Baldwin JK, Fletcher LB, Kim JB, Ng A, Redmer R, Reid AH, Shekhar P, Shen XZ, Shen M, Sokolowski-Tinten K, Tsui YY, Wang YQ, Zheng Q, Wang XJ, Glenzer SH. Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction. Science 2018; 360:1451-1455. [PMID: 29954977 DOI: 10.1126/science.aar2058] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 05/01/2018] [Indexed: 11/02/2022]
Abstract
The ultrafast laser excitation of matters leads to nonequilibrium states with complex solid-liquid phase-transition dynamics. We used electron diffraction at mega-electron volt energies to visualize the ultrafast melting of gold on the atomic scale length. For energy densities approaching the irreversible melting regime, we first observed heterogeneous melting on time scales of 100 to 1000 picoseconds, transitioning to homogeneous melting that occurs catastrophically within 10 to 20 picoseconds at higher energy densities. We showed evidence for the heterogeneous coexistence of solid and liquid. We determined the ion and electron temperature evolution and found superheated conditions. Our results constrain the electron-ion coupling rate, determine the Debye temperature, and reveal the melting sensitivity to nucleation seeds.
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Ying XZ, Qian JJ, Peng L, Zheng Q, Zhu B, Jin YH. Model research on repairing meniscus injury in rabbits using bone marrow mesenchymal stem cells and silk fibroin meniscus porous scaffold. EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2018; 22:3689-3693. [PMID: 29949141 DOI: 10.26355/eurrev_201806_15247] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE The purpose of this study is to evaluate the histocompatibility and feasibility of structure and function of bone marrow mesenchymal stem cells (BMSCs) and silk fibroin meniscus porous scaffolds in repairing meniscus injury in rabbits. MATERIALS AND METHODS BMSCs were cultured and identified in vitro, silk fibroin meniscus porous scaffolds were prepared and the histocompatibility of porous scaffolds was evaluated via in vitro culture. Silk fibroin-BMSCs porous scaffolds were implanted into the meniscus defect area of New Zealand white rabbits as the experimental group, the blank scaffold group without BMSCs, pure BMSCs group and blank control group were set up with 10 rabbits in each group. Joint capsules were opened for general observation at 6 weeks and 12 weeks after operation. The specimens received the HE staining, alkaline toluidine blue staining, and immunohistochemical staining of Type I and Type II collagen and S100 protein. RESULTS In vitro HE staining and SEM observation showed that the scaffolds showed the sponge-like structure with abundant microporous structure on the surface and inside, which had a good histocompatibility with BMSCs. At 6 and 12 weeks after operation in experimental group, meniscus-like tissues were found in the meniscus defect area. HE staining showed the fibrous cartilage-like structure and obvious collagenous fiber structure around arranged in an orderly manner. Alkaline toluidine blue staining showed the cartilage-specific glycosaminoglycan (GAG); Type I and Type II collagen and S100 protein staining were strongly positive. However, the above changes were not seen in other groups. CONCLUSIONS BMSCs and silk fibroin meniscus porous scaffolds have a better histocompatibility and feasibility of structure and function in repairing meniscus injury in rabbits.
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Zheng Q, Lin Y, Chen P, Fan YP. The long noncoding RNA BC0209135 inhibits the cell invasion through Wnt/β-catenin signaling in colorectal cancer. EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2018; 22:3763-3770. [PMID: 29949151 DOI: 10.26355/eurrev_201806_15258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Previous studies have shown that BC029135, a long noncoding RNA (lncRNA) with high conservation, was decreased with high fold change in colorectal cancer (CRC) by using microarray assay. In the present work, we investigated the functions of BC029135 in CRC, as well as the potential mechanisms underlying the malignant phenotype caused by loss of BC029135. MATERIALS AND METHODS Bioinformatics analysis of lncRNA BC029135 was performed to identify the potential function. The cell lines of HCT-116, SW480, SW620, LoVo, SW1116, and HT29 were used in this study. The mRNA expression of BC029135 and β-actinin was measured by Real-Time Polymerase Chain Reaction (RT-PCR). Western blot analysis was used to determine protein expression of β-actinin, MMP-2, cyclin D1, and c-Myc. RESULTS Our research showed that the expression of BC029135 in CRC tissues and cell lines was significantly lower than in adjacent normal tissues. In addition, overexpression of lncRNA BC029135 could inhibit the invasion of CRC cells. We also found that lncRNA BC029135 inhibits Wnt/β-catenin signaling in CRC cell lines. CONCLUSIONS We suggest that up-regulation of BC029135 suppresses CRC invasion and inactivates Wnt/β-catenin signaling. It will provide new insights for the treatment of colorectal cancer and new clues for clinical treatment.
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Zheng Q, Yang X, Maeno H, Marshall C, Prouty S, O'Day C, Yeh C, Anagnos V, Chen A, Barriera P, Bashir H, Pack M, Capelson M, Seykora J. 213 Nucleoporins are frequently mutated in SCCIS and loss of function promotes UV-induced neoplasia. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Zhu C, Wang L, Zhang Q, Xu H, Tong J, Wan Y, Zheng Q. 113P Exosomal miRNAs in peripheral blood as novel diagnostic biomarkers of radioresistant lung adenocarcinoma. J Thorac Oncol 2018. [DOI: 10.1016/s1556-0864(18)30387-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Wu C, Pan W, Feng C, Su Z, Duan Z, Zheng Q, Hua C, Li C. Grafting materials for alveolar cleft reconstruction: a systematic review and best-evidence synthesis. Int J Oral Maxillofac Surg 2018; 47:345-356. [DOI: 10.1016/j.ijom.2017.08.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 05/30/2017] [Accepted: 08/09/2017] [Indexed: 10/18/2022]
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Zheng Q, Martin G, Wu Y, Kentish S. The use of monoethanolamine and potassium glycinate solvents for CO 2 delivery to microalgae through a polymeric membrane system. Biochem Eng J 2017. [DOI: 10.1016/j.bej.2017.09.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Dong Z, Xu L, Liu H, Lv Y, Zheng Q, Li L. Comparative efficacy of five long-term weight loss drugs: quantitative information for medication guidelines. Obes Rev 2017; 18:1377-1385. [PMID: 29024559 DOI: 10.1111/obr.12606] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 07/24/2017] [Accepted: 08/03/2017] [Indexed: 12/22/2022]
Abstract
Quantitative information is scarce in current obesity medication guidelines, and they do not clearly reflect the differences in the efficacy characteristics among various drugs. This study quantitatively assessed the efficacy characteristics of five FDA-approved long-term weight loss drugs. Potentially eligible studies were obtained from public databases. Using the differences in the weight change from baseline between the drug group and the corresponding placebo group as the major indicator of efficacy, a time-effect model was established, and crucial pharmacodynamic parameters, such as the maximal efficacy, drug onset time and rate of body weight regain after the maximal efficacy point, were used to reflect the differences in efficacy among the five drugs. Finally, 50 reports (involving 43,443 participants) were included. After deducting the placebo effects, the maximal efficacies (95% CI) of orlistat (120 mg), lorcaserin, naltrexone-bupropion, phentermine-topiramate (PT, 7.5/46 mg) and liraglutide were -2.94 (-5.82, -1.27), -3.06 (-4.39, -1.71), -6.15 (-9.78, -3.25), -7.45 (-9.76, -3.88) and -5.50 (-10.62, -2.97) kg at weeks 60, 54, 67, 59 and 65 respectively, and their rates of body weight regain were 0.51, 0.48, 0.91, 1.27and 0.43 kg per year respectively. The 1-year dropout rates of orlistat, lorcaserin, naltrexone-bupropion, PT and liraglutide were 29.0, 40.9, 49.1, 34.9 and 24.3% respectively. In addition, a significant dose-effect correlation was observed for orlistat and PT. This study provides valid quantitative information for medication guidelines.
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Zheng M, Wang A, Wang T, Thien C, Gao J, Zheng Q, Ebert J. AKT activation by uni-axial mechanical stimulation is essential for repair of micro damages in tendon during daily activities. J Sci Med Sport 2017. [DOI: 10.1016/j.jsams.2017.09.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Xia W, Zheng Q, Lu Q, Wang S. Effect of postmastectomy radiotherapy on breast cancer with isolated tumor cells or micrometastases in regional lymph nodes: A propensity score matched analysis using the SEER database. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx654.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ning K, Jiang L, Yang ZP, Zheng Q, Bao YM. 13 Atp-sensitive potassium channels mediate the cardioprotection of panax notoginseng saponins against myocardial ischemia reperfusion injury and inflammatory reaction. J Investig Med 2017. [DOI: 10.1136/jim-2017-mebabstracts.13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Sokolowski-Tinten K, Shen X, Zheng Q, Chase T, Coffee R, Jerman M, Li RK, Ligges M, Makasyuk I, Mo M, Reid AH, Rethfeld B, Vecchione T, Weathersby SP, Dürr HA, Wang XJ. Electron-lattice energy relaxation in laser-excited thin-film Au-insulator heterostructures studied by ultrafast MeV electron diffraction. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2017; 4:054501. [PMID: 28795080 PMCID: PMC5522339 DOI: 10.1063/1.4995258] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 07/10/2017] [Indexed: 05/19/2023]
Abstract
We apply time-resolved MeV electron diffraction to study the electron-lattice energy relaxation in thin film Au-insulator heterostructures. Through precise measurements of the transient Debye-Waller-factor, the mean-square atomic displacement is directly determined, which allows to quantitatively follow the temporal evolution of the lattice temperature after short pulse laser excitation. Data obtained over an extended range of laser fluences reveal an increased relaxation rate when the film thickness is reduced or the Au-film is capped with an additional insulator top-layer. This behavior is attributed to a cross-interfacial coupling of excited electrons in the Au film to phonons in the adjacent insulator layer(s). Analysis of the data using the two-temperature-model taking explicitly into account the additional energy loss at the interface(s) allows to deduce the relative strength of the two relaxation channels.
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Wang S, Lu Q, Qin T, Xu F, Zeng Y, Xia W, Zheng Q, Lee K, Zhang K, Qin G, Kong M, Hong R, Shi Y, Yuan Z. Clinical implication of PLR and PD-L1 in breast cancer patients. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx363.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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